INFO: rcu detected stall in tasklet_action_common

[syzbot]

Hello,

syzbot found the following issue on:

HEAD commit: a1b977b4 Linux 4.19.150
git tree: linux-4.19.y
console output: https://syzkaller.appspot.com/x/log.txt?x=168c11cf900000
kernel config: https://syzkaller.appspot.com/x/.config?x=c14008c8da1ca4d4
dashboard link: https://syzkaller.appspot.com/bug?extid=276749c45ee44705c648
compiler: gcc (GCC) 10.1.0-syz 20200507

Unfortunately, I don't have any reproducer for this issue yet.

IMPORTANT: if you fix the issue, please add the following tag to the commit:
Reported-by: syzbot+276749...@syzkaller.appspotmail.com

rcu: INFO: rcu_sched detected stalls on CPUs/tasks:
rcu: 0-....: (10183 ticks this GP) idle=b02/1/0x4000000000000004 softirq=177135/177158 fqs=4954
rcu: (detected by 1, t=10502 jiffies, g=18673, q=1)
Sending NMI from CPU 1 to CPUs 0:
NMI backtrace for cpu 0
CPU: 0 PID: 25541 Comm: syz-executor.2 Not tainted 4.19.150-syzkaller #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 01/01/2011
RIP: 0010:get_current arch/x86/include/asm/current.h:15 [inline]
RIP: 0010:__sanitizer_cov_trace_pc+0x4/0x50 kernel/kcov.c:100
Code: 04 0f 88 4c 89 25 7c db bc 0b 41 bc f4 ff ff ff e8 c0 7b e9 ff 48 c7 05 66 db bc 0b 00 00 00 00 e9 39 ec ff ff 90 48 8b 34 24 <65> 48 8b 04 25 40 ee 01 00 65 8b 15 5c 1b 90 7e 81 e2 00 01 1f 00
RSP: 0018:ffff8880ae207550 EFLAGS: 00000082
RAX: 1ffff11015c44b86 RBX: dffffc0000000000 RCX: 7fffffffffffffff
RDX: 0000000000000000 RSI: ffffffff816242bf RDI: ffff8880ae225bc0
RBP: 0000000000000000 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000004 R12: 0000000000000086
R13: ffff8880ae225bc0 R14: 7fffffffffffffff R15: ffff8880ae225bc0
FS: 00007f547f924700(0000) GS:ffff8880ae200000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 000000000118c000 CR3: 000000000946d000 CR4: 00000000001406f0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:
<IRQ>
__next_base kernel/time/hrtimer.c:480 [inline]
__hrtimer_next_event_base+0x1f/0x260 kernel/time/hrtimer.c:500
__hrtimer_get_next_event kernel/time/hrtimer.c:565 [inline]
hrtimer_interrupt+0x402/0x9a0 kernel/time/hrtimer.c:1524
local_apic_timer_interrupt arch/x86/kernel/apic/apic.c:1067 [inline]
smp_apic_timer_interrupt+0x135/0x5d0 arch/x86/kernel/apic/apic.c:1092
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
RIP: 0010:orc_find arch/x86/kernel/unwind_orc.c:150 [inline]
RIP: 0010:unwind_next_frame+0x276/0x2430 arch/x86/kernel/unwind_orc.c:429
Code: 89 74 24 28 48 89 44 24 20 48 89 4c 24 18 e8 61 ec 77 00 48 8b 74 24 28 48 8b 44 24 20 48 8b 4c 24 18 44 8b 1c b5 84 7f 1e 8c <8d> 70 01 48 ba 00 00 00 00 00 fc ff df 48 8d 3c b5 84 7f 1e 8c 49
RSP: 0018:ffff8880ae207758 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: 000000000006e002 RBX: 1ffff11015c40ef3 RCX: ffffffff87e0027c
RDX: 0000000000000007 RSI: 000000000006e002 RDI: ffffffff8c39ff8c
RBP: 0000000000000002 R08: 0000000000000000 R09: 0000000000000001
R10: ffff8880ae20788f R11: 000000000014d953 R12: ffff8880ae207878
R13: ffff8880ae207865 R14: ffff8880ae207880 R15: ffff8880ae207830
__save_stack_trace+0x83/0x100 arch/x86/kernel/stacktrace.c:44
save_stack mm/kasan/kasan.c:448 [inline]
set_track mm/kasan/kasan.c:460 [inline]
kasan_kmalloc+0xeb/0x160 mm/kasan/kasan.c:553
slab_post_alloc_hook mm/slab.h:445 [inline]
slab_alloc_node mm/slab.c:3340 [inline]
kmem_cache_alloc_node_trace+0x13c/0x4d0 mm/slab.c:3666
__do_kmalloc_node mm/slab.c:3688 [inline]
__kmalloc_node_track_caller+0x38/0x70 mm/slab.c:3703
__kmalloc_reserve net/core/skbuff.c:137 [inline]
__alloc_skb+0xae/0x580 net/core/skbuff.c:205
skb_copy+0x139/0x300 net/core/skbuff.c:1349
mac80211_hwsim_tx_frame_no_nl+0xc58/0x1420 drivers/net/wireless/mac80211_hwsim.c:1353
mac80211_hwsim_tx_frame+0xe1/0x180 drivers/net/wireless/mac80211_hwsim.c:1556
mac80211_hwsim_beacon_tx+0x45f/0x720 drivers/net/wireless/mac80211_hwsim.c:1595
__iterate_interfaces+0x2ff/0x4c0 net/mac80211/util.c:614
ieee80211_iterate_active_interfaces_atomic+0xab/0x1b0 net/mac80211/util.c:650
mac80211_hwsim_beacon+0xea/0x1b0 drivers/net/wireless/mac80211_hwsim.c:1615
__tasklet_hrtimer_trampoline+0x29/0xa0 kernel/softirq.c:601
tasklet_action_common.constprop.0+0x265/0x3a0 kernel/softirq.c:522
__do_softirq+0x27d/0xad2 kernel/softirq.c:292
invoke_softirq kernel/softirq.c:372 [inline]
irq_exit+0x22d/0x270 kernel/softirq.c:412
exiting_irq arch/x86/include/asm/apic.h:544 [inline]
smp_apic_timer_interrupt+0x15f/0x5d0 arch/x86/kernel/apic/apic.c:1094
apic_timer_interrupt+0xf/0x20 arch/x86/entry/entry_64.S:894
</IRQ>
RIP: 0010:__sanitizer_cov_trace_pc+0x22/0x50 kernel/kcov.c:101
Code: 00 00 e9 39 ec ff ff 90 48 8b 34 24 65 48 8b 04 25 40 ee 01 00 65 8b 15 5c 1b 90 7e 81 e2 00 01 1f 00 75 2b 8b 90 e0 12 00 00 <83> fa 02 75 20 48 8b 88 e8 12 00 00 8b 80 e4 12 00 00 48 8b 11 48
RSP: 0018:ffff88821395f758 EFLAGS: 00000246 ORIG_RAX: ffffffffffffff13
RAX: ffff88802dce23c0 RBX: 0000000000000001 RCX: ffffffff819da80b
RDX: 0000000000000000 RSI: ffffffff819da818 RDI: 0000000000000001
RBP: 0000000000000001 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000000001 R11: 0000000000000000 R12: ffffea00024fd480
R13: 00007f5480ba5000 R14: dffffc0000000000 R15: ffffea00024fd448
native_local_ptep_get_and_clear arch/x86/include/asm/pgtable.h:1041 [inline]
ptep_get_and_clear_full arch/x86/include/asm/pgtable.h:1123 [inline]
zap_pte_range mm/memory.c:1334 [inline]
zap_pmd_range mm/memory.c:1452 [inline]
zap_pud_range mm/memory.c:1481 [inline]
zap_p4d_range mm/memory.c:1502 [inline]
unmap_page_range+0x1018/0x2ec0 mm/memory.c:1523
unmap_single_vma+0x198/0x300 mm/memory.c:1568
unmap_vmas+0xa9/0x180 mm/memory.c:1598
exit_mmap+0x2b9/0x530 mm/mmap.c:3093
__mmput kernel/fork.c:1015 [inline]
mmput+0x14e/0x4a0 kernel/fork.c:1036
exit_mm kernel/exit.c:546 [inline]
do_exit+0xb12/0x2d80 kernel/exit.c:874
do_group_exit+0x125/0x320 kernel/exit.c:990
get_signal+0x3f3/0x2270 kernel/signal.c:2588
do_signal+0x8f/0x1690 arch/x86/kernel/signal.c:821
exit_to_usermode_loop+0x204/0x2c0 arch/x86/entry/common.c:163
prepare_exit_to_usermode arch/x86/entry/common.c:198 [inline]
syscall_return_slowpath arch/x86/entry/common.c:271 [inline]
do_syscall_64+0x57c/0x670 arch/x86/entry/common.c:296
entry_SYSCALL_64_after_hwframe+0x49/0xbe
RIP: 0033:0x45de59
Code: Bad RIP value.
RSP: 002b:00007f547f923cf8 EFLAGS: 00000246 ORIG_RAX: 00000000000000ca
RAX: 0000000000000001 RBX: 000000000118bf28 RCX: 000000000045de59
RDX: 00000000000f4240 RSI: 0000000000000081 RDI: 000000000118bf2c
RBP: 000000000118bf20 R08: 000000000000000e R09: 0000000000000000
R10: 0000000000000003 R11: 0000000000000246 R12: 000000000118bf2c
R13: 00007ffdcfa909ff R14: 00007f547f9249c0 R15: 000000000118bf2c


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[syzbot]

Auto-closing this bug as obsolete.
Crashes did not happen for a while, no reproducer and no activity.